linux-kernel - Re: [this_cpu_xx V9 4/7] Generic inc / dec percpu instructions

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Message-ID: <alpine.DEB.2.00.1001050919570.1074@router.home>
Date:	Tue, 5 Jan 2010 09:21:18 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
cc:	linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Subject: Re: [this_cpu_xx V9 4/7] Generic inc / dec percpu instructions

On Tue, 5 Jan 2010, Tejun Heo wrote:

> According to gcc doc, __builtin_constant_p() returns 1 on constant and
> 0 if not.  It doesn't return the original expression.  I'll commit the
> following updated version after testing.

Great. Thanks. That means that most of the percpu uses currently are incs
and decs not adds. Machine worked fine with the buggy patch.
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